premenstrual

形容词 premenstrual:

1. of or relating to or occurring during the period just before menstruation

pre.men.stru.al

adj.（形容词）
Of, relating to, or occurring in the period just before menstruation.
行经前的：关于或发生在月经来之前不久的时期的

【引伸】
premen.strually
adv.（副词）